DO NOT MERGE Avoid size_t overflow in base64 decoding once again
Switch to foundation base64 function in OggExtractor and fix the
issue there.
This reverts commit 28314aef9e8a666dbb75bbd555f6566a6c991f1c.
Bug: 23707088
Change-Id: I268bd50431de5b5e579343bf1b425c42ada6daba